Explain why most sidewalks have built in cracks every few feet

A 4.2 kg sled is being pulled along a snow-covered road with a rope that exerts a horizontal force of 6.0 n and, at that moment, is accelerating at 1.1 m/s2 on level ground with friction having no significant effect.

Electric charge can accumulate on an airplane in flight. You may have observed needle-shaped metal extensions on the wing tips and tail of an airplane. Their purpose is to allow charge to leak off before much of it accumulates.

How is an inflated balloon affected by cold air

What is Energy? A.) The ability to do work. B.) force*Distance C.) Force D.) Chemical Change

A typical nuclear power plant converts 0.01% of the mass of its fuel into energy through nuclear reactions. how much fuel would be needed to power an average city for one day?

How do you get a resultant factor? A. Add two or more vectors B. Add two scalars C. Multiply two scalars D. Multiply two vectors

A panpipe is made of five pipes. The longest pipe is 25 centimeters long and the shortest is 5 centimeters long. Which of these pipe produces the highest-frequency sound and why?

Model rocket A is launched at an angle of 70° above the x axis, with an initial velocity of 40 m/s. An identical rocket B is launched under the same conditions at an angle of 90° above the x axis, also with an initial velocity of 40 m/s.

Why is it that when you throw a Frisbee, it flies better when it is normally thrown and not upside down?

Four blocks of weights are required using which any body whose weight is between 1kg and 40 kg can be weighed. Find the four weights